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Related Party Transactions - Narrative (Details)
12 Months Ended
Jul. 31, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 29, 2016
USD ($)
Dow          
Related Party Transaction [Line Items]          
Payment amount for services $ 5,000,000.0 $ 120,000 $ 1,819,000 $ 5,138,000  
Outstanding payable   100,000 0.0    
Director | Mutual services agreement          
Related Party Transaction [Line Items]          
Outstanding payable   0 0    
Consulting fee, daily         $ 5,000
Consulting hours provided for each hour of technical support given, ratio         0.5
Expenses paid per service agreement   $ 0 $ 0